US 11,757,424 B2
Band-pass filter
Takuya Sato, Tokyo (JP); and Yuta Ashida, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Mar. 3, 2022, as Appl. No. 17/686,071.
Claims priority of application No. 2021-037867 (JP), filed on Mar. 9, 2021.
Prior Publication US 2022/0294410 A1, Sep. 15, 2022
Int. Cl. H03H 7/01 (2006.01); H03H 7/075 (2006.01); H03H 1/00 (2006.01)
CPC H03H 7/0161 (2013.01) [H03H 7/0115 (2013.01); H03H 7/075 (2013.01); H03H 7/1741 (2013.01); H03H 2001/0085 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A band-pass filter that selectively passes a signal of a frequency within a predetermined passband, the band-pass filter comprising:
a first input/output port;
a second input/output port; and
a first high-pass filter, a first low-pass filter, and a first stub resonator that are between the first input/output port and the second input/output port in a circuit configuration, wherein:
the first input/output port, the second input/output port, the first high-pass filter and the first low-pass filter are configured in the circuit configuration such that the signal inputted to one of the first input/output port and the second input/output port passes through the first high-pass filter and the first low-pass filter and is outputted from a second of the first input/output port and the second input/output port;
each of the first high-pass filter and the first low-pass filter includes at least one first inductor and at least one first capacitor;
the first stub resonator includes a first distributed constant line;
the first low-pass filter is between the first input/output port and the first high-pass filter in the circuit configuration; and
the first distributed constant line has a first end connected to a first path connecting the first input/output port and the first low-pass filter and a second end closest to a ground in the circuit configuration.